As for the rest of the acts of Shallum, along with the conspiracy he led, they are indeed written in the Book of the Chronicles of the Kings of Israel.
The best days of the kingdom of Israel were while the government was in Jehu's family. In his reign, and the next three reigns, though there were many abominable corruptions and miserable grievances in Israel, yet the crown went in succession, the kings died in their beds, and some care was taken of public affairs; but, now that those days are at an end, the...
Commenting on 2 Kings 15:8-31
And Menahem exacted the money of Israel, even of all the mighty men of wealth,.... Who were most able to pay it, by which means he eased the poor, and might thereby attach them to him: of each man fifty shekels of silver, to give to the king of Assyria: that is, he required them to pay fifty shekels apiece to make up the above...
2Ki 15:13-16 Reign of Shallum. - Shallum reigned only a full month (ירח־ימים, as in Deu 21:13; see at Gen 29:14). Menahem the son of Gadi then made war upon him from Tirzah; and by him he was smitten and slain. Menahem must have been a general or the commander-in-chief, as Josephus affirms.
Commenting on 2 Kings 15:13-16